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Virginia DEQ

Virginia Water Science Center

 
  Duration Plot and Table of 14-Day Average Streamflow
 
01672500 SOUTH ANNA RIVER NEAR ASHLAND, VA
LOCATION.--Latitude 37°47'48", Longitude 77°32'57", North American Datum of 1927,
                    Hanover County, VA, Hydrologic Unit 02080106.
DRAINAGE AREA.--395 square miles.
PERIOD OF RECORD.--October 1930 to September 1997, June 2003 to current year.
DURATION STATISTIC COMPUTATION PERIOD.--All data through September 2007.
REGULATION.--Small diurnal fluctuation at low flow in some years caused by mills upstream from station. Since 1966, diversion upstream averaged less than 0.6 cfs. Capacity of the diversion is about 1.5 cfs.
GAGE OPERATION.--U.S. Geological Survey, Virginia Water Science Center.
     Duration Plot with 14-Day Average Streamflow Conditions
Provisional Data Subject to Revision 01672500 plot. SOUTH ANNA RIVER NEAR ASHLAND, VA
Provisional Data Subject to Revision

                    

The current 14-day running-average value for 08/27/2008 is 14.5 cubic feet per second.

  explanation   Percentile Description Duration Plot Description 28 Day 14 Day 7 Day Daily
      Duration Table of 14-Day Average Streamflow
            Flow values in cubic feet per second


                01672500     SOUTH ANNA RIVER NEAR ASHLAND, VA

   Minimum daily flow
   5th percentile
 
   10th percentile
 
   25th percentile
 
 
   Median
 
 
   75th percentile
 
 
 
   90th percentile
 
 
 
   95th percentile
 
 
 
 
   Maximum daily flow
         
Years of record
January
55.4
97.5
143
264
433
638
979
1,230
2,880
 
71
February
52.8
134
189
297
475
713
1,050
1,290
2,900
 
71
March
97.0
199
252
362
532
775
1,010
1,350
3,360
 
71
April
108
171
204
314
482
758
1,090
1,370
3,530
 
71
May
87.7
118
139
193
298
449
756
980
3,620
 
71
June
33.5
68.1
80.4
116
188
289
486
655
3,900
 
71
July
19.9
42.5
52.2
77.4
117
212
373
588
3,950
 
71
August
7.43
25.4
30.5
55.8
101
201
465
723
4,390
 
72
September
4.86
15.4
19.6
36.3
87.0
173
492
734
4,360
 
72
October
6.73
13.5
22.1
49.6
97.2
212
493
882
2,370
 
70
November
13.0
37.4
52.6
89.4
158
348
605
861
2,400
 
71
December
29.1
68.3
87.9
155
280
484
772
1,010
2,540
 
71
 
       

The current 14-day running-average value for 08/27/2008 is 14.5 cubic feet per second.

---- Provisional Data Subject to Revision ----

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